2. 输出乘法口诀表

#include <stdio.h>
#include<windows.h>
int main()
{
int i = 1;
for (; i <= 9;i++){
int j = 1;
for (; j <= i; j++){
printf("%d*%d=%d\t",i,j,i*j );
}
printf("\n");
}
system("pause");
return 0;
}